Visitors to the west end of Golden Gate Park enjoy the Dutch Windmill and the Queen Wilhelmina Garden in San Francisco, Calif. on Sunday October 18, 2009.

Visitors to the west end of Golden Gate Park enjoy the Dutch Windmill and the Queen Wilhelmina Garden in San Francisco, Calif. on Sunday October 18, 2009.

Photo: Lea Suzuki, The Chronicle

Visitors to the west end of Golden Gate Park enjoy the Dutch... Photo-2024038.35884 - SFGate

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The bison in San Francisco's Golden Gate Park, brought to the park by John McLaren in 1891, when the species was teetering on extinction. The current herd, down to six females photographed on Wednesday, October 29, 2008. less

The bison in San Francisco's Golden Gate Park, brought to the park by John McLaren in 1891, when the species was teetering on extinction. The current herd, down to six females photographed on Wednesday, ... more

Names of those that have died of aids engraved at the Circle of Friends in the National AIDS Memorial Grove at Golden Gate Park in San Francisco, Calif., on Monday, May 24, 2010.

Names of those that have died of aids engraved at the Circle of Friends in the National AIDS Memorial Grove at Golden Gate Park in San Francisco, Calif., on Monday, May 24, 2010.

Photo: Liz Hafalia, The Chronicle

Names of those that have died of aids engraved at the Circle of... Photo-2068306.35884 - SFGate

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Flowers are placed by the names of those who died of AIDS as people gather in the National AIDS Memorial Grove in Golden Gate Park.

Flowers are placed by the names of those who died of AIDS as people gather in the National AIDS Memorial Grove in Golden Gate Park.

Photo: Kim Komenich, The Chronicle

Flowers are placed by the names of those who died of AIDS as people... Photo-2068307.35884 - SFGate

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The flooded rain forest Exhibit is shown at the new California Academy of Sciences in San Francisco, Thursday, Sept. 18, 2008. On the ground floor of the exhibit, tropical fish swim in the flooded roots of trees. Then an elevator takes visitors up, into the canopy where birds fly free in a giant glass dome. (AP Photo/Paul Sakuma) less

The flooded rain forest Exhibit is shown at the new California Academy of Sciences in San Francisco, Thursday, Sept. 18, 2008. On the ground floor of the exhibit, tropical fish swim in the flooded roots of ... more

Photo: Paul Sakuma, AP

The flooded rain forest Exhibit is shown at the new California... Photo-2068308.35884 - SFGate

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Some of the 20 penguins at the new exhibit in The California Academy of Sciences. The California Academy of Sciences in its new Golden Gate park building introduced the whole African Penguin colony with a big show in the Academy's African Hall on Wednesday, June 18, 2008 in San Francisco, Calif. Photo By Christina Izzo/ The Chronicle less

Some of the 20 penguins at the new exhibit in The California Academy of Sciences. The California Academy of Sciences in its new Golden Gate park building introduced the whole African Penguin colony with a big ... more

Photo: Christina Izzo, The Chronicle

Some of the 20 penguins at the new exhibit in The California... Photo-2068309.35884 - SFGate

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A bird flies near the Chinese Pavillion at Stow Lake in Golden Gate Park in San Francisco, Calif., on Friday, January 9, 2009.

A bird flies near the Chinese Pavillion at Stow Lake in Golden Gate Park in San Francisco, Calif., on Friday, January 9, 2009.

Photo: Mark Costantini, The Chronicle

A bird flies near the Chinese Pavillion at Stow Lake in Golden Gate... Photo-2068310.35884 - SFGate

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Bridge over Stow Lake in Golden Gate Park in San Francisco, Calif., on Friday, January 9, 2009.

Bridge over Stow Lake in Golden Gate Park in San Francisco, Calif., on Friday, January 9, 2009.

Lila Holt age 3 takes a last look while leaving one of the Bay Area's most historical Carousel, located in Golden Gate Park, on the west side of Koret Children's Quarter Playground. Tuesday June 30, 2009.

Lila Holt age 3 takes a last look while leaving one of the Bay Area's most historical Carousel, located in Golden Gate Park, on the west side of Koret Children's Quarter Playground. Tuesday June 30, 2009.

Photo: Lance Iversen, The Chronicle

Lila Holt age 3 takes a last look while leaving one of the Bay... Photo-2068313.35884 - SFGate

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During a break in the rains, Richard Lindstrom of San Francisco walks his dog, Justine, through a tunnel that goes under John F. Kennedy Drive in Golden Gate Park, on Tuesday Apr. 27, 2010, in San Francisco, Calif. less

During a break in the rains, Richard Lindstrom of San Francisco walks his dog, Justine, through a tunnel that goes under John F. Kennedy Drive in Golden Gate Park, on Tuesday Apr. 27, 2010, in San Francisco, ... more

Photo: Michael Macor, The Chronicle

During a break in the rains, Richard Lindstrom of San Francisco... Photo-2068314.35884 - SFGate

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The Anglers Lodge as people practice throwing their lines at Golden Gate Park in San Francisco, Calif., on Monday, May 24, 2010.

The Anglers Lodge as people practice throwing their lines at Golden Gate Park in San Francisco, Calif., on Monday, May 24, 2010.

Photo: Liz Hafalia, The Chronicle

The Anglers Lodge as people practice throwing their lines at Golden... Photo-2068315.35884 - SFGate

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Renzo Piano, the architect of the California Academy of Sciences in Golden Gate Park in San Francisco, Calif. is in town to survey the completed project, Thursday Sept. 25, 2008. Piano on the living roof of the building. less

Renzo Piano, the architect of the California Academy of Sciences in Golden Gate Park in San Francisco, Calif. is in town to survey the completed project, Thursday Sept. 25, 2008. Piano on the living roof of the ... more

Claude, the albino alligator that greets visitors at the California Academy of Sciences in Golden Gate Park, San Francisco, Calif. is back home in his swamp after veterinarians tended to an infected foot last January. less

Claude, the albino alligator that greets visitors at the California Academy of Sciences in Golden Gate Park, San Francisco, Calif. is back home in his swamp after veterinarians tended to an infected foot last ... more

Photo: Michael Macor, The Chronicle

Claude, the albino alligator that greets visitors at the California... Photo-2068317.35884 - SFGate

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As the sun shines brightly overhead, Grace Sohn, 3, runs through a row of poppies in front of the Conservatory of Flowers in Golden Gate Park on Monday Feb. 22, 2009 in San Francisco, Calif.

As the sun shines brightly overhead, Grace Sohn, 3, runs through a row of poppies in front of the Conservatory of Flowers in Golden Gate Park on Monday Feb. 22, 2009 in San Francisco, Calif.

The Conservatory of Flowers is the most fun building in Golden Gate Park!

The Conservatory of Flowers is the most fun building in Golden Gate Park!

Photo: John King

The Conservatory of Flowers is the most fun building in Golden Gate... Photo-2068319.35884 - SFGate

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A Dahlia named the 49er shows off it's brilliant colors at the Dahlia Dell in San Francisco Golden Gate Park Saturday July 24, 2010. The Dell is in full bloom, drawing crowds from as far away as Sacramento. The flowers will bloom now through November and are located just steps away from the Conservatory of Flowers. less

A Dahlia named the 49er shows off it's brilliant colors at the Dahlia Dell in San Francisco Golden Gate Park Saturday July 24, 2010. The Dell is in full bloom, drawing crowds from as far away as Sacramento. The ... more

Photo: Lance Iversen, The Chronicle

A Dahlia named the 49er shows off it's brilliant colors at the... Photo-2068320.35884 - SFGate

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Visitors to San Francisco Golden Gate Park admire the Dahlia Dell Saturday July 24, 2010. The Dell is in full bloom, drawing crowds from as far away as Sacramento. The flowers will bloom through November and are located just steps away from the Conservatory of Flowers. less

Visitors to San Francisco Golden Gate Park admire the Dahlia Dell Saturday July 24, 2010. The Dell is in full bloom, drawing crowds from as far away as Sacramento. The flowers will bloom through November and ... more

The Sharon Building in Golden Gate Park, now used for arts and crafts classes, is a rare first-rate example of Richardsonian Romanesque architecture in San Francisco. It is from 1887

The Sharon Building in Golden Gate Park, now used for arts and crafts classes, is a rare first-rate example of Richardsonian Romanesque architecture in San Francisco. It is from 1887

Photo: John King, The Chronicle

The Sharon Building in Golden Gate Park, now used for arts and... Photo-2024037.35884 - SFGate

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4 year-old Elyjah Olney, of Vacaville, takes cover under the fountain in the middle of the music concourse of Golden Gate Park to hide from his brother, playing games in San Francisco, Calif., on Friday May 15, 2009 during a visit with his family. less

4 year-old Elyjah Olney, of Vacaville, takes cover under the fountain in the middle of the music concourse of Golden Gate Park to hide from his brother, playing games in San Francisco, Calif., on Friday May 15, ... more

Gaston Mazo, left and Carlos Oxford were among the twenty-five thousand participants who walked through Golden Gate Park in the 22nd annual AIDS Walk.
Photo by Michael Maloney / The Chronicle

Gaston Mazo, left and Carlos Oxford were among the twenty-five thousand participants who walked through Golden Gate Park in the 22nd annual AIDS Walk.
Photo by Michael Maloney / The Chronicle

Photo: Michael Maloney, The Chronicle

Gaston Mazo, left and Carlos Oxford were among the twenty-five... Photo-2068332.35884 - SFGate

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A sea of fans clap for Buddy Miller at the Tower of Gold Stage during the Hardly Strictly Bluegrass Festival, Golden Gate Park on Saturday October 3, 2009 in San Francisco, Calif.

A sea of fans clap for Buddy Miller at the Tower of Gold Stage during the Hardly Strictly Bluegrass Festival, Golden Gate Park on Saturday October 3, 2009 in San Francisco, Calif.

Photo: Michael Macor, The Chronicle

A sea of fans clap for Buddy Miller at the Tower of Gold Stage... Photo-2068333.35884 - SFGate

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(Left to right) Christopher Ray and Sahki "Miz Broken Disco Ball" Chata, both of San Francisco, make their way through Golden Gate Park with other runners during the 2010 Bay to Breakers in San Francisco, Calif. on Sunday May 16, 2010. less

(Left to right) Christopher Ray and Sahki "Miz Broken Disco Ball" Chata, both of San Francisco, make their way through Golden Gate Park with other runners during the 2010 Bay to Breakers in San Francisco, ... more